Update project configuration and structure with Docker support and environment variable adjustments

- Updated .env.example to reflect new LLM configuration with Aliyun's API.
- Enhanced .gitignore to include additional files and directories for better exclusion of sensitive and build artifacts.
- Added docker-compose.yml for streamlined deployment of backend and frontend services.
- Introduced Dockerfiles for both backend and frontend to facilitate containerized builds.
- Created README.md to provide comprehensive project documentation and setup instructions.
- Established nginx configuration for frontend to support API proxying and static file serving.

.gitignore

@@ -1,24 +1,50 @@
+# OS
 .DS_Store
+Thumbs.db
+
+# 环境变量（保护敏感信息）
 .env
 .env.local
-.env.development.local
-.env.test.local
-.env.production.local
+.env.*.local
 .env.development
 .env.test
 .env.production
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
-__pycache__/
 
-.vscode
-.idea
-.pytest_cache
-.pytest_cache
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+.venv/
+venv/
+ENV/
+.eggs/
+*.egg-info/
+dist/
+build/
+
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# 测试
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Cursor
 .cursor/
 
+# 文档与测试程序
 mydoc/
 mytest/
 
@@ -27,4 +53,7 @@ backend/logs/
 *.log
 
 # 上传文件
-backend/uploads/
+backend/uploads/
+
+# Docker 数据
+data/